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Income Taxes - Additional Information (Details) - USD ($)	1 Months Ended		3 Months Ended		9 Months Ended
	Oct. 31, 2016	Sep. 30, 2015	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent					21.00%
Unrecognized Tax Benefits			$ 2,754,000		$ 2,754,000		$ 2,424,000
Income Tax Examination, Penalties and Interest Accrued			100,000		100,000
Subsidiary Revenue		$ 66,000,000
Reversal of Service Tax Refund	$ 160,000
Service Tax Credit Receivable	$ 1,000,000
Income Tax Expense (Benefit)			421,000	$ 469,000	493,000	$ 1,502,000
Income Tax Examination, Increase (Decrease) in Liability from Prior Year			$ 200,000		$ 200,000
Maximum [Member]
Income Taxes [Line Items]
Percentage for Subsidiary Service Tax		15.00%
Minimum [Member]
Income Taxes [Line Items]
Percentage for Subsidiary Service Tax		12.36%

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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